Elvish Warpiper

Elvish Warpiper's power and toughness are each equal to the number of creatures you control.
{2}{w}{g}{t}, Creatures you control gain Vigilance until end of turn.
{2}{r}{g}{t}, Creatures you control gain Trample until end of turn.
{x}{r}{w}{t}, Creatures you control get +X/+X until end of turn.